Secondary electric battery



(No Model.)

W. K. FREEMAN.

SECONDARY ELEGTRIGBATTBRY.

Patented Ja.11.16,l.883.

n c a s u o Q .v n n n a n n c l .J n .9 v s u n n u a u l o u n n n l e n l o l n n E fffff f 'UNITED STATES PATENTl OFFICE.

WALTER K. FREEMAN, OF BROOKLYN, NEW YORK, ASSIGNOR TO W. F.

JOBBINS, OF EAST ORANGE, NEW JERSEY.'

SECONDARY ELECTRIC BATTERY.

SPECIFICATION forming part of Letters Patent No. 270,778, dated January 16, 1883.

Application tiled Juno 15, 1882. (No model.)

.l'o all whom it may concern Be it known that I, WALTER K. FREEMAN, a citizen of the United States, and a resident of Brooklyn, New York, have invented certain Improvements in Secondary Electric Battelies, of which the following is a specification.

My invention consists of certain improvements, more fully described hereinafter, in the construction ot' secondary electric batteries based on the well-known Plante secondary batteries, which are rendered active by first passing an electric current through them.

In the accompanying drawings, Figurel is a' vertical section of a secondary battery constructed according to my invention; Figa-2, a side view ofthe electrodes; and Fig. 3, an enlarged transverse section on the line 1 2, Fig. 2.

In Fig. l I have shown a battery having four electrodes, E, inclosed in a case, A, containing the dilute sulphuric acid or other suitable electrolytic fluid, the electrodes being shown as connected up in pairs to suitable binding-posts, a. l separate the electrodes one from another by interposing a porous layer, B, preferably ot' spoil ge, and I preferably bind the electrodes and intermediate porous layers together by means of bands D, of rubber, cord, or similar material. Each electrode E is constructed, as shown in Figs. 2 and 3, of two sheets, c e, of lead, in each ot' which is formed a seriesof circular concave recesses by dishing the sheet of lead, and the center of each circular dish or recess is perforated, as seen in Fig. 3. When the two dished plates are placed face to face with corresponding cavities opposite each other, there are formed a series of circular pockets, in which is placed the oxide of lead or equivalent insoluble material. rIhe plates, with the intervening oxide, are 'secured together by means of leaden rivets passed through the plates and strips ff. By thus constructing the electrodes with a series of separate pockets for. the reception of the insoluble material they do not polarize so rapidly as do the electrodes with flat, corrugated, or similar plates, in which the oxide extendsin uninterrupted strips or layers from top to bottom of the electrodes, for in such case the polarization, when it once sets in, spreads rapidly upward through the material. By having the material in separate pockets the polarization is preventedt'rom spreading.

The battery is formed7 by passing through it. a current from an active battery or dynamoelectric machine in the usual manner.

It will be understood that although I have shown in the drawings a battery With only varied indefinitely.

I claim as my inventionposed ot' two lead plates secured together, and each having a series of circular concave and perforated recesses, forming together circular pockets for the insoluble oxide or similar material, substantially as described.

2. An electrode for seconda'ry batteries, composed of two lead plates secured together by lead rivets and strips, and each having a series of circular concave and perforated recesses containing the insoluble oxide or similar material, substantially as set forth.-

3. A secondary battery provided with electrodes consisting` of lead plates secured together, and having circular dshed and perforated recesses between them containing the insoluble oxide or similar material, and layers ot' porous material between the electrodes.

1n testimony whereof l have signed my name to this specification in the presence of two sub scribing witnesses.

VALTER K. FREEMAN.

Witnesses:

JOHN H. KA'r'rENs'rRorH,

HUBERTjHoWsoN.

four'electrodes, their number and size may befs 1. An electrode l'or secondary batteries,com 

